c# - Ball is moving at same velocity despite changing velocity variable in unity -

i creating pong , working fine, however, wanted there power-ups ball velocity changes. have velocity variable seems change nothing speed @ ball starts, velocity stays flat. here image of ball panel.

and here code inside ball script

    public float ballvelocity = 1000;  rigidbody rb; bool isplay; int randint; public vector3 velocity;  float elapsed = 0; private bool onleft; public vector3 startpos = new vector3(0, 0, 0); void awake() {     rb = getcomponent<rigidbody>();     randint = random.range(1,3);     velocity = new vector3 (ballvelocity, ballvelocity, 0);  }  void update() {      if (rb.transform.position.x < gameobject.findgameobjectwithtag ("paddle").transform.position.x) {         print ("game over");      }     if (rb.position.x < 0)         onleft = true;     else         onleft = false;      elapsed += time.deltatime;     rb.drag = 0;     print(onleft);     if (elapsed > 5) {          //rb.velocity *= .5f;         elapsed = 0;      }       rb.maxdepenetrationvelocity = ballvelocity;     if (input.getmousebutton(0) && isplay == false)     {         transform.parent = null;         isplay = true;         rb.iskinematic = false;          if (randint == 1)         {             rb.addforce(new vector3(ballvelocity, ballvelocity, 0));          }         if (randint == 2)         {             rb.addforce(new vector3(-ballvelocity, -ballvelocity, 0));          }     } } 

}

no matter have tried, or have looked up, nothing seems help. please me this. time!

the simplest way change object's speed grab it's current velocity rb.velocity, normalize .normalized, , set rb.velocity vector multiplied speed @ want ball go at.

here example code doing this:

void changespeed(float speed) {     vector3 dir = rb.velocity.normalized;     rb.velocity = dir * speed; } 

if system lossless (100% bounce, no drag, on) after doing this, ball stay @ speed until change again.